200427929 玖、發明說明： (一） 發明所屬之技術領域 本發明揭示一種控制單元，用於驅動電扇裝備之調節電 晶體，其中調節電晶體串聯連接電子式整流電扇，具有控 制裝置以視控制輸入電壓而定之控制信號方式來類比# 11 動調節電晶體。 (二） 先前技術 電扇裝備之尤其用於電腦，通常具有此種控制，使得能 控制電扇之轉速。高電扇轉速連帶高噪音準位，許多使用 者受其擾煩。因此，在高品質電腦中，習用使得電扇之轉 速適用各別冷卻需求。在低負載之期間，電腦產生少量的 熱，而僅需要低冷卻容量，結果電扇可以低轉速來作業。 電扇以串聯連接之調節電晶體來控制，使得其可設定跨 接在電扇之電壓。所使用電路原理如第2圖所示，其中電 扇1、調節電晶體2及電流量測電阻器3以串聯連接在工 作電壓UB之端間。電流量測電阻器3具有非常小値，而且 在電子式整流電扇之情形中，可作用來檢測電扇電流及根 據其所包含整流脈衝來判定其電扇轉速。 調節電晶體2可以簡單方式來影響跨接在電扇1之電壓 。控制單元4提供來驅動調節電晶體4跨接在調節電晶體 2之電壓降及因而跨接在電扇1之電壓視控制單元4所影 響驅動而改變。在圖示之情形中，調節電晶體2作業爲電 壓隨耦器，即在射極之電壓以基極之電壓及基極-射極電壓 來定義。本電路引述爲可以連接調節電晶體來實施之其他 -5- 200427929 電路原理的代表例。 第3圖所不是習用技術之控制單元的具體實施例，其中 控制單兀4包含以運算放大器6所驅動之控制電晶體5。 控制輸入電壓Uin施加到運算放大器6之倒相輸入（inverting input)。視控制輸入電壓Uin之大小而定，控制電晶體5較 大或較小程度地導通，因而改變在控制單元4之控制輸入 處的電壓U e。„ t r。！。控制輸入電壓u i n以連接到電流量測電 阻器Rs之轉速檢測裝置8來產生。 爲了獲得電扇1之可靠轉速調節，很重要地在轉速檢測 裝置8可靠地識別電扇馬達1之整流脈衝。然而，根據習 用技術之電路情形中的問題，在於作業電壓UB會發生變動 ’ β口作業電壓UB是由DC電壓分量VG1及AC電壓分量UAC 所組成。AC電壓分量UAC可具有和整流脈衝相同之頻率， 如果 AC電壓分量影響通過電流量測電阻器之電流，結果 會發生電扇脈衝之錯誤識別。在相同電源供給單元上之其 他負載產生突然負載變化時，例如諸如具有致動節省電力 功能之硬碟或處理器，將隨時發生作業電壓之突然變動。 爲了解決本問題，習知藉由電感器線圈及電容器來提供 電扇之作業電壓的分離被動式濾波。這兩個組件之缺點爲 產生比較性地大尺寸及高額外成本之增加。 對本問題之其他解決方案中’爲了識別整流，電扇之電 流變動檢測爲百分比，比較大於作業電壓之百分比變動的 差異百分比。換言之，如果作業電壓可變動例如± 5 %，而 且例如，電扇整流之識別臨限値是土 1 5 %，則其初始地可假 -6- 200427929 設不能發生錯誤識別。 然而，在本方法之情形中，如果電扇以減小作業電壓來 作業’整流脈衝之錯誤識別也可能發生。這可由根據第2 及3圖之習用技術的電路考量來看，其中調節電晶體2進 給穩定調節電壓到電扇。當變動調節電壓出現在電扇1之 其一端處時，穩定電壓進給到電扇1之另一端。因而，跨 在電扇1之電壓也變動，相對地通過電扇1之變動電流流 量發生。這變動電流在電流量測電阻器Rs兩端引出電壓。 而且進給到轉速檢測裝置8。這具有效應在作業電壓之變 動會導致錯誤識別。因此，即使此一脈衝沒有出現，而是 例如在節省電力模態中處理器致動所造成干擾電壓，也識 別整流脈衝。 電壓變動之大小可以下述方程式來計算，根據第3圖所 示習用電路做爲參考，其中控制電路以開放吸極 (open-di*ain)架構及運算放大器之N-MOS電晶體來產生。 電扇電壓結果爲200427929 (1) Description of the invention: (1) The technical field to which the invention belongs The present invention discloses a control unit for driving a regulating transistor of an electric fan equipment, wherein the regulating transistor is connected in series with an electronic rectifying fan, and has a control device to control the input voltage depending on The control signal method is analogous to # 11 to dynamically adjust the transistor. (II) Prior technology Electric fan equipment, especially for computers, usually has such control, which can control the speed of the electric fan. High fan speeds are accompanied by high noise levels, and many users are troubled by them. Therefore, in high-quality computers, customizing makes the speed of electric fans suitable for individual cooling needs. During periods of low load, the computer generates a small amount of heat and only requires a low cooling capacity. As a result, the fan can operate at a low speed. The electric fan is controlled by a series-connected regulating transistor, so that it can set the voltage across the electric fan. The principle of the circuit used is shown in Figure 2. The fan 1, the adjusting transistor 2 and the current measuring resistor 3 are connected in series between the terminals of the operating voltage UB. The current measuring resistor 3 has a very small size, and in the case of an electronic rectifier fan, it can function to detect the fan current and determine its fan speed based on the rectification pulses it contains. Adjusting transistor 2 can affect the voltage across fan 1 in a simple way. The control unit 4 is provided to drive the regulating transistor 4 across the voltage drop across the regulating transistor 2 and thus the voltage across the fan 1 changes depending on the driving effected by the control unit 4. In the situation shown in the figure, the adjustment transistor 2 operates as a voltage follower, that is, the voltage at the emitter is defined by the base voltage and the base-emitter voltage. This circuit is quoted as a representative example of other circuit principles that can be implemented by adjusting a transistor. FIG. 3 is not a specific embodiment of the control unit of the conventional technology. The control unit 4 includes a control transistor 5 driven by an operational amplifier 6. The control input voltage Uin is applied to an inverting input of the operational amplifier 6. Depending on the size of the control input voltage Uin, the control transistor 5 is turned on to a greater or lesser extent, thereby changing the voltage U e at the control input of the control unit 4. Tr: The control input voltage uin is generated by the rotation speed detecting device 8 connected to the current measuring resistor Rs. In order to obtain a reliable speed adjustment of the electric fan 1, it is important to reliably identify the electric fan motor 1 in the rotating speed detecting device 8. Rectification pulse. However, the problem in the circuit situation according to the conventional technology is that the operating voltage UB changes. The β-port operating voltage UB is composed of a DC voltage component VG1 and an AC voltage component UAC. The AC voltage component UAC may have and rectify The pulses have the same frequency. If the AC voltage component affects the current passing through the current measurement resistor, the false identification of the fan pulse will occur as a result. When other loads on the same power supply unit have sudden load changes, such as having an actuation to save power Functional hard disks or processors will have sudden changes in operating voltage at any time. In order to solve this problem, it is known to separate the passive filtering of the operating voltage of the fan through the inductor coil and capacitor. The disadvantage of these two components is that they generate Comparatively large size and high additional cost increase. Other solutions to this problem In the solution, in order to identify the rectification, the current change of the electric fan is detected as a percentage, which is greater than the percentage difference of the percentage change of the operating voltage. In other words, if the operating voltage can be changed, for example, ± 5%, and the identification threshold of the electric fan rectification is, for example, earth 15%, it is initially false-6-200427929 It is assumed that no misrecognition can occur. However, in the case of this method, if the fan operates with a reduced operating voltage, the misrecognition of the rectification pulse may also occur. This can be caused by According to the circuit considerations of the conventional technology in Figures 2 and 3, the adjustment transistor 2 feeds a stable adjustment voltage to the fan. When the variable adjustment voltage appears at one end of the fan 1, the stable voltage is fed to the fan 1. The other end. Therefore, the voltage across the electric fan 1 also changes, and relatively, the fluctuating current flow through the electric fan 1 occurs. This fluctuating current draws a voltage across the current measuring resistor Rs. And it is fed to the rotation speed detecting device 8. This It has the effect that the fluctuation of the operating voltage will lead to misidentification. Therefore, even if this pulse does not appear, it will be In the power saving mode, the interference voltage caused by the processor's activation also recognizes the rectification pulse. The magnitude of the voltage fluctuation can be calculated by the following equation, based on the conventional circuit shown in Figure 3 as a reference, where the control circuit is based on the open open-di * ain) architecture and the N-MOS transistor of the operational amplifier. The fan voltage result is
Ufan = UGl+UAc + UBE· Ucontr〇i 在本情形中，UC(5„tr()1 = Uinx(Rl+R2)/R2 爲真， 其中 UG1 =作業電壓之DC電壓分量 UAC =作業電壓之AC電壓分量 UBE =調節電晶體2之基極-射極電壓 穩定調節電壓 雖然穩定調節電壓用於電扇之轉速調整可變動，但是其所 200427929 涉及具有時間常數通常在1 〇〇ms範圍內之相當緩慢電壓改 變。相對照地，整流脈衝之時間常數通常是1 hi s。 如果在計算實例中假設UG1 = 12V’ Uac = ±0.5V，Ube = -0.7V 及U e。n t r。1 = 8 V ’則獲得下述跨接在電扇之電壓：Ufan = UGl + UAc + UBE · Ucontr〇i In this case, UC (5 „tr () 1 = Uinx (Rl + R2) / R2 is true, where UG1 = DC voltage component of operating voltage UAC = operating voltage AC voltage component UBE = base-emitter voltage of regulating transistor 2 Stable regulating voltage Although the stable regulating voltage is used to adjust the speed of the electric fan, it can be changed, but its 2004200429 involves the equivalent of a time constant usually in the range of 1000ms. Slow voltage change. In contrast, the time constant of the rectified pulse is usually 1 hi s. If UG1 = 12V 'Uac = ± 0.5V is assumed in the calculation example, Ube = -0.7V and U e. Ntr. 1 = 8 V 'The following voltages are obtained across the fan:
Ufan = l2V±0.5V-0.7V-8V = 3.3V±0.5V = 3.3V±15% 不管作業電壓變動只是± 5 %，然而，電扇電壓變動± 1 5 %， 假設電扇之歐姆行爲（ohmic behavior)，現在期望±15%之電 流變動，使得在電流量測電阻器Rs處之電壓也變動土 1 5 %。 進一步問題是市售商用電扇之內部電扇電子組件非線性 行爲所造成困擾。此典型電扇之開關接通/切斷（on/off)臨 限値是在3 V之作業電壓，即，尤其如果在電扇連續地開關 接通/切斷之最差情形中電流變動會更大於± 1 5 %。則轉速檢 測裝置8不正確地詮釋開關接通/切斷爲電扇整流所造成之 電流變動。 (三）發明內容 本發明之目的在提供一種用於電扇裝備之控制單元，其 中作業電壓之變動沒有造成轉速檢測裝置不正確地識別整 流脈衝。 本目的根據本發明在申請專利序文所述型式之控制單元 來獲得’其特徵事實上在控制單元包含補償裝置，以視電 扇裝備作業電壓之AC電壓分量而定方式來影響控制信號 使得作業電壓之A C電壓分量完全地或局部地補償跨在 電扇的電壓。 以根據本發明控制單元之架構，控制信號根據作業電壓 各 200427929 之A C電壓分量來追踪。如此，如果作業電壓例如增加5 % ，則驅動調節電晶體使得在電扇之另一端處之電壓，在最 佳情形中也因而增加相同電壓大小，結果跨在電扇之全部 電壓保持不變。 在較佳架構中，補償裝置使用運算放大器，控制輸入電 壓傳送到其一輸入端，而作業電壓傳送到另一輸入端。在 本情形中，更佳地此電路處理不用電容器，因此可在積體 電路中以簡單方式來使用。 在具體架構中，作業電壓經由電壓分壓器來進給到運算 放大器之倒相輸入端，而且控制輸入電壓進給非倒相輸入 端。在本情形中，運算放大器驅動控制電晶體，其決定所 提供在電路之控制輸出端處的控制信號大小來驅動調節電 晶體。 (四）實施方式 第1圖表示電扇裝備，其具有電扇1、調節電晶體2及 電流量測電阻器3，串聯連接及連接到作業電壓UB。調節 電晶體2以根據本發明之控制單元4來驅動。而且，提供 轉速檢測裝置8，其一方面連接到電流量測電阻器3，另一 方面提供用於控制單元4之控制輸入電壓Uin。如上所述， 作業電壓會發生變動，結果電壓UB= UG1+ UAC可大於或小 於公稱作業電壓UG ,，出現跨接在包含電扇1、調節電晶體 2及電流量測電阻器3之裝備兩端。變動電壓經由具有電 阻器R3及R4之電壓分壓器來進給到運算放大器6的倒相 輸入端。轉速檢測裝置8所產生控制輸入電壓U i n進給到 -9- 200427929 運算放大器6之非倒相輸入端。 運算放大器6之輸出端連接到N-MOS電晶體5之閘極端 。後者一方面連接到大地，另一方面到控制單元之控制輸 出端7，該控制輸出端提供用於連接調節電晶體2之控制 輸入端。第一電阻器R 1配置在控制輸出端7及運算放大器 6之非倒相輸入端。而且，非倒相輸入端連接到第二電阻 器R2，其中施加控制輸入電壓Uin。多加電阻器連接到控 制輸出端7及作業電壓。其作用爲輸出電晶體之啓動電阻 器（pull-up resistor) ° 根據本發明之控制單元4實施兩個調節電路。第一調節 電路以轉速之檢測及對應控制信號UeQ„tr()1之產生來形成 ，以其來驅動調節電晶體2。轉速檢測裝置8所決定實際 轉速比較所期望轉速ndesired，而產生用於控制信號之視偏 差而定的控制輸入電壓Uin。第一調節電路之時間常數比較 地大，而且通常在數個ms範圍內。因爲所要冷卻之裝備溫 度也比較地緩慢改變，所以不需要更快之調節。 第二調節電路形成事實是由於作業電壓UB之AC分量的 大致更快速電壓變動’經由具有弟二及第四電阻益R3及 R4之分壓器來傳送到運算放大器6。結果多加輸入變數來 決定控制信號UeDntrQl。 在正常作業期間，即，如果沒有A C電壓重疊’則過低 實際轉速造成控制輸入電壓U i n降低。結果，運算放大器6 之輸出電壓也減小。驅動調節電晶體2之控制信號U。。n 對應地降低。由於電晶體2之低基極電壓，因爲牽涉電壓 -10- 200427929 隨親器，所以射極電壓也降低。然而，導致跨在電扇1之 電壓之更商値’因爲在電扇1之另一端處的作業電壓UB 保持不變。因而電扇轉得更快，其在電流量測電阻器3處 來檢測。 雖然以上述調節機構由於A C電壓分量u A c在作業電壓 之快速改變；以上述調節機構沒有明顯地改變電扇1的轉 速，但是跨在電扇1之電壓會發生瞬間增加，其導致經過 電扇1及因而電流量測電阻器3之更高電流，其最後造成 整流脈衝之錯ek識別’結果識別比實際出現之更高轉速。 根據本發明之控制單元4以經由具有電阻器R3及r4之 電壓分壓器’使得作業電壓進給到運算放大器6之倒相輸 入端來防止。作業電壓之瞬間增加導致運算放大器6輸出 電壓降低。因此，控制信號Uec)ntr()1增加，其導致在調節電 晶體2射極處之電壓增加及因而在電扇1之下端處的電壓 也增加。如此，跨在電扇1之電壓保持不變。經過電扇1 及電流量測電阻器3之電流對應地保持不變。如此，防止 轉速檢測裝置8之整流脈衝的錯誤識別。 視電阻器Rl、R2、R3及R4之大小而定，結果在作業電 壓之變動是完全或局部補償。獲得作業電壓變動之完全補 償的方法如下文計算所示。用於跨在電扇1之電壓結果如 下： (I) Ufan = UGl+UAc + UBE-Ucontrol 因爲在運算放大器6之非倒反輸入端處的電壓U+，等於 在運算放大器6之倒相輸入端處的電壓U -，結果如下： -11- 200427929 (Π) (Ucontro丨-Uin)*R2/(Rl+R2) + Uin = (UG1+UAC)*R4/(R3+R4) 如果選擇比値 R1/R2 = R3/R4，則 R2/(R1+R2) = R4(R3 + R4) 也爲真，在方程式重新排列後結果如下： - (Ucontrol-Uin)*a + Uin = (UG】+UAC)*a .Ufan = l2V ± 0.5V-0.7V-8V = 3.3V ± 0.5V = 3.3V ± 15% Regardless of the operating voltage variation is only ± 5%, however, the fan voltage variation is ± 15%, assuming ohmic behavior of the fan ), Now expect a current variation of ± 15%, so that the voltage at the current measurement resistor Rs also varies by 15%. A further problem is the distress caused by the non-linear behavior of the internal fan electronics of commercially available fans. The on / off threshold of this typical electric fan is at an operating voltage of 3 V, that is, the current variation will be greater than in the worst case where the fan is continuously switched on / off. ± 1 5%. Then, the rotation speed detecting device 8 incorrectly interprets the current variation caused by the fan rectification when the switch is turned on / off. (3) Summary of the Invention The object of the present invention is to provide a control unit for electric fan equipment, in which the variation of the operating voltage does not cause the rotational speed detecting device to incorrectly identify the rectifying pulse. The purpose of the present invention is to obtain a control unit of the type described in the preamble of the patent application. The feature is that the control unit actually includes a compensation device that affects the control signal in a way that depends on the AC voltage component of the operating voltage of the fan equipment. The AC voltage component completely or partially compensates the voltage across the fan. With the structure of the control unit according to the present invention, the control signal is tracked according to the AC voltage component of each of the operating voltages 200427929. In this way, if the operating voltage is increased by, for example, 5%, the driving transistor is driven so that the voltage at the other end of the electric fan is also increased by the same voltage in the best case, so that the entire voltage across the electric fan remains unchanged. In a preferred architecture, the compensation device uses an operational amplifier, the control input voltage is transmitted to one input terminal, and the operating voltage is transmitted to the other input terminal. In this case, it is better that this circuit is handled without a capacitor, so it can be used in a simple manner in an integrated circuit. In a specific architecture, the operating voltage is fed to the inverting input of the operational amplifier via a voltage divider, and the input voltage is controlled to feed the non-inverting input. In this case, the operational amplifier drives the control transistor, which determines the size of the control signal provided at the control output of the circuit to drive the adjustment transistor. (Fourth Embodiment) Fig. 1 shows an electric fan equipment including an electric fan 1, a regulating transistor 2 and a current measuring resistor 3, which are connected in series and connected to an operating voltage UB. The control transistor 2 is driven by a control unit 4 according to the invention. Further, a rotation speed detecting device 8 is provided, which is connected to the current measuring resistor 3 on the one hand and a control input voltage Uin for the control unit 4 on the other hand. As mentioned above, the operating voltage will change. As a result, the voltage UB = UG1 + UAC can be greater than or less than the nominal operating voltage UG, and it appears across the equipment including the fan 1, the adjusting transistor 2 and the current measuring resistor 3. The fluctuating voltage is fed to an inverting input terminal of the operational amplifier 6 via a voltage divider having resistors R3 and R4. The control input voltage U i n generated by the rotation speed detecting device 8 is fed to the non-inverting input terminal of the operational amplifier 6. The output terminal of the operational amplifier 6 is connected to the gate terminal of the N-MOS transistor 5. The latter is connected to the ground on the one hand, and to the control output terminal 7 of the control unit on the other hand. This control output terminal provides a control input terminal for connecting the regulating transistor 2. The first resistor R 1 is disposed at the control output terminal 7 and the non-inverting input terminal of the operational amplifier 6. Moreover, the non-inverting input terminal is connected to the second resistor R2, where the control input voltage Uin is applied. A multi-resistor is connected to the control output 7 and the operating voltage. Its function is the pull-up resistor of the output transistor ° The control unit 4 according to the invention implements two adjustment circuits. The first regulating circuit is formed by detecting the rotation speed and generating the corresponding control signal UeQ tr () 1 to drive the adjustment transistor 2. The actual rotation speed determined by the rotation speed detecting device 8 is compared with the desired rotation speed ndesired, and is used for The control input voltage Uin depends on the deviation of the control signal. The time constant of the first regulating circuit is relatively large, and usually within a few ms. Because the temperature of the equipment to be cooled also changes relatively slowly, it does not need to be faster The fact that the second regulation circuit is formed is due to the substantially faster voltage change of the AC component of the operating voltage UB 'to the operational amplifier 6 via a voltage divider having second and fourth resistors R3 and R4. The result is more input Variable to determine the control signal UeDntrQl. During normal operation, that is, if there is no AC voltage overlap, the actual input speed is too low to cause the control input voltage U in to decrease. As a result, the output voltage of the operational amplifier 6 is also reduced. The drive adjustment transistor 2 The control signal U .. n decreases accordingly. Due to the low base voltage of transistor 2, because the voltage involved is -10- 200427929 With the device, the emitter voltage is also reduced. However, the more voltage across the fan 1 is caused because the operating voltage UB at the other end of the fan 1 remains unchanged. Therefore, the fan turns faster, which The current is measured by the resistor 3. Although the above-mentioned adjustment mechanism changes the operating voltage rapidly due to the AC voltage component u A c; the above-mentioned adjustment mechanism does not significantly change the speed of the electric fan 1, but the voltage across the electric fan 1 will An instantaneous increase occurs, which results in a higher current passing through the fan 1 and thus the current measurement resistor 3, which finally results in a wrong ek identification of the rectified pulses. The result identification is a higher speed than actually occurs. The control unit 4 according to the present invention uses The voltage divider with resistors R3 and r4 is used to prevent the operating voltage from being fed to the inverting input of the operational amplifier 6. The instantaneous increase of the operating voltage causes the output voltage of the operational amplifier 6 to decrease. Therefore, the control signal Uec) ntr (1) increases, which results in an increase in the voltage at the emitter of the regulating transistor 2 and thus an increase in the voltage at the lower end of the fan 1. Thus, the voltage across the fan 1 is increased. Keep the same. The current passing through the fan 1 and the current measuring resistor 3 remains the same. In this way, the incorrect recognition of the rectification pulse of the speed detection device 8 is prevented. It depends on the size of the resistors R1, R2, R3 and R4 The result is that the change in operating voltage is fully or partially compensated. The method for obtaining full compensation for the change in operating voltage is shown in the following calculations. The results for the voltage across fan 1 are as follows: (I) Ufan = UGl + UAc + UBE- Ucontrol Because the voltage U + at the non-inverting input of the operational amplifier 6 is equal to the voltage U-at the inverting input of the operational amplifier 6, the result is as follows: -11- 200427929 (Π) (Ucontro 丨 -Uin) * R2 / (Rl + R2) + Uin = (UG1 + UAC) * R4 / (R3 + R4) If you choose the ratio 1 / R1 / R2 = R3 / R4, then R2 / (R1 + R2) = R4 (R3 + R4) It is also true. After the equations are rearranged, the result is as follows:-(Ucontrol-Uin) * a + Uin = (UG] + UAC) * a.
Ucontro 丨 *a+ Uin*(l-a) = UGi*a + UAC*aUcontro 丨 * a + Uin * (l-a) = UGi * a + UAC * a
Ucontro 丨= 1101+ UAC-Uin*(l-a)/a 0 插置到電扇方程式（I)內，結果如下：Ucontro 丨 = 1101+ UAC-Uin * (l-a) / a 0 is inserted into the fan equation (I), and the result is as follows:
Ufan = UGi+UAc + UBE-(UGi + UAC-Uin*(l - a)/a) = Uin + (l-a)/a + UBE ° _ 如此所示，假設上述電阻比値之選擇，則電扇電壓在電路 之調節範圍內和作業電壓無關，完全地和D C電壓分量U(n 及AC電壓分量Uac無關。僅控制輸入電壓Uin重要。結果 消除作業電壓變動所產生整流脈衝之錯誤識別問題。 (五）圖式簡單說明 根據本發明，控制單元之進一步較佳架構說明在附屬申 |胃胃@項目。同樣地也說明根據本發明之包含控制單元的 電扇裝備。 _ 本：發明將利用範例實施例在下文中更詳細地來說明，其 中： 胃1 Η表示根據本發明之具有控制單元的電扇裝備範例 實施例； 弟2及3圖表示習用技術之電路裝備。 主要部件之代表符號說明 1 電扇 -12- 200427929 2 調節電晶體 3 電流量測電阻器 4 控制單元 5 控制電晶體/N-MOS電晶體 6 運 算 放 大 器 7 控 制 輸 出 8 轉 速 檢 測 裝 置 U c ο n t r 〇 1 控 制 信 號 Uin 控 制 輸 入 電 壓 UB 作 業 電 壓 Ugl 作 業 電 壓 之 DC Uac 作 業 電 壓 之 AC U d e s i r e d 所 期 望 轉 速 R1、R2、 R3 、 R4 電 阻 器 電壓分量 電壓分量 -13-Ufan = UGi + UAc + UBE- (UGi + UAC-Uin * (l-a) / a) = Uin + (la) / a + UBE ° _ As shown above, assuming the above resistance ratio is selected, the fan voltage It has nothing to do with the operating voltage within the adjustment range of the circuit, and has nothing to do with the DC voltage component U (n and AC voltage component Uac. It is only important to control the input voltage Uin. As a result, the problem of erroneous identification of rectification pulses caused by fluctuations in operating voltage is eliminated. (5) ) The diagram briefly illustrates that according to the present invention, a further preferred architecture of the control unit is described in the subsidiary application | Weiwei @ Item. It also describes the electric fan equipment including the control unit according to the present invention. _ This: The invention will use example embodiments In the following, it will be explained in more detail, in which: Stomach 1 Η represents an exemplary embodiment of an electric fan equipment with a control unit according to the present invention; Figures 2 and 3 show circuit equipment of conventional technology. Representative symbol description of main components 1 Electric fan-12 -200427929 2 Adjusting transistor 3 Current measurement resistor 4 Control unit 5 Control transistor / N-MOS transistor 6 Operational amplifier 7 Control output 8 Speed detection device U c ο nt r 〇 1 Control signal Uin Control input voltage UB Operation voltage Ugl Operation voltage DC Uac Operation voltage AC U d e s i r e d Expected speed R1, R2, R3, R4 Resistor voltage component Voltage component -13-